Hi i bought my car with the chip already in it . I have been have problems and by doing searches it seems to be the chip . My question is if i remove the chip do i need a factory chip? Thanks Roger

 

If you remove you need the appropriate chip installed. Need not be factory.

Are you seeing a code for prom?

 

I did not try it yet thanks for quick reply

 

hi can anyone help me where in the ecm to replace the chip ? i did a search no luck thank you roger

 

I found pics at photobucket....

http://media.photobucket.com/user/BC...g.html?filters[term]=ECM%20prom&filters[primary]=images&filters[secondary]=videos&sort=1&o=2#/user/BCGearhead/media/87-91/ECM/Calprom_2.jpg.html?filters%5Bterm%5D=ECM%20prom&filters%5Bprimary%5D=images&filters%5Bsecondary%5D=videos&sort=1&o=2&_suid=137960204371202084778610774886

You may find this helpfull https://www.thirdgen.org/forums/diy-...uide-book.html

 

I don't think he means that indepth.

I think he just means what parts (plug and play) need to be removed.

Without knowing the exact vehicle you have, and what engine it is equipped with, it's difficult to tell you exactly what to look for.

In any case, the OBD1 GM ECMs will have a removable panel that is held on with 2 1/4" headed screws. Under this cover you will find a MEMCAL (large blue item), or a 24 pin EPROM that is in a black plastic carrier.

Since you say that it has an aftermarket chip already, and uses a MEMCAL, it may have a MEMCAL adapter installed, that retains the stock MEMCAL, plugged into the side of it, that retains certain parts of the MEMCAL.

 

it does have that side memcal adapter on it and i have a 1992 z/28 305 i found the ecm and took out the chip and put back the factory chip . it ran better but after a few runs it ran bad and then would not start . i had to put my foot to the floor on the gas pedal to start it i dont know where to start fuel ecm thank you roger

 

If you have to put your foot to the floor you are in clear flood mode. The ecm shuts off injector pulse. Sounds like you have a rich condition , I would pull off the vacuum line to the fuel pressure regulator and check for signs of fuel. The next step would be to cycle the key several times and start pulling spark plugs. I suspect a stuck open injector or injectors. A bad cts, tps will also cause a rich running condition.

 

thank you for the help my ecm is a7-7730 is that rite and should i start a new thread in ecm area ?

 

77-730 ! That is the correct ecm it is a remanufactured cardone iirc the factory replacement for a 1227730. What makes you think the ecm is faulty ? No communication in field service mode or with a scanner ?